Doctor of Philosophy (PHD)
Biology (Arts and Sciences)
Date of Defense
First Committee Member
Michael S. Gaines - Committee Chair
Second Committee Member
William A. Searcy - Committee Member
Third Committee Member
David Janos - Committee Member
Fourth Committee Member
W. Douglas Robinson - Outside Committee Member
Habitat loss and fragmentation occur at unprecedented rates, especially in tropical countries where human activities have deforested or degraded around 80% of tropical rainforests. Tropical forest fragmentation is considered the main cause of extinction of tropical forest avifauna, yet the mechanisms by which fragmentation affects bird populations are poorly understood. The present study investigates the pattern of bird species distribution in a fragmented landscape in tropical southeastern Mexico and the relation of bird community and species distribution patterns to landscape and fragment characteristics. Area and isolation of forest fragments were the main determinant of species richness and abundance in fragments, especially for forest-dependent species. The significant effect of isolation on species persistence in forest fragments suggests that limitation of dispersal is one potential mechanism by which fragmentation affects species distribution in the landscape. To understand how fragmentation can affect bird dispersal in a fragmented landscape, the effect of open areas and corridors on movement patterns of forest birds was investigated. The evidence presented in this study supports the idea that bird movement is restricted by open areas, especially for forest-restricted birds. Forested corridors had a positive effect on movement rates of forest birds, potentially acting to preserve movement and dispersal processes, and ultimately species persistence, in heavily fragmented landscapes.
Mexico; Gap-crossing; Isolation; Forest Corridors; Species Distribution
Ibarra-Macias, Ana C., "Effects of Habitat Fragmentation on the Distribution and Movement of Tropical Forest Birds" (2009). Open Access Dissertations. 481.